That's better. Closing the socket is always polite.

zeromq/hwclient.rb

@@ -1,4 +1,4 @@
-# vim:fileencoding=utf-8
+# vim:fileencoding=utf-8:expandtab
 
 require 'zmq'
 
@@ -8,14 +8,19 @@ def main
   puts "Connecting to hello world server…"
   requester = context.socket(ZMQ::REQ)
   requester.connect("tcp://localhost:5555")
+  puts "requester is a #{requester.class.inspect}"
 
   0.upto(9) do |request_nbr|
     puts "Sending request #{request_nbr}…"
-    requester.send("Hello")
+    if requester.send("Hello")
-
+      puts "Sent request, now receiving reply"
-    reply = requester.recv(6)
+      reply = requester.recv
-    puts "Received reply #{request_nbr}: [#{reply}]"
+      puts "Received reply #{request_nbr}: [#{reply}]"
+    end
   end
+
+  puts "Outside of loop now.  Closing socket..."
+  requester.close
 end